The modem dialup handshake analyzed

Those of you old enough to get internet connection with an empty can of beans connected to a string will probably remembered a coal-powered tool of the time, the modem. Its shrieks filled the beginning of an evening of bad GIFs, short web pages with <blink> tags, and plenty of telnet and IRC sessions. The memorable combination of sounds was a bit of a mystery to me, but I found this extremely interesting blog post detailing the negotiation phase, step by step, directly on the spectrogram. Worth checking out if you ever wondered what your modem was saying.

Comments are closed.